Tack-pulling machine.



F. L. MAOKENZIE.

TACK PULLING MACHINE. APPLICATION FILED APR. 3, 1911.

Patented 52111.9, 1912.

2 SHEETS-SHEET 1.

P. LRMAGKENZIE.

TACK PULLING MACHINE.

APPLICATION FILED APR. 8, 1911.

1,013,944. I I PaLentedJan.9,1912.

25 2 SHEETS-SHEET 2.

IE'RED L. MACKENZIE, OE BEVERLY MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY. al

TACK-PULLING MACHINE.

Patented Jan. 9,1912.

, Application filed April 8, 1911. Serial No. 619,775.

To all whom it may concern:

Be it known that I, FRED L. MACKENZIE, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certam new and useful Improvement-s in Tack-Pulling Machines; and I do hereby declare the following to be a'full, clear, and exact description of the invention, such as will enable others skilled in the. artto which it appertains to make and use the same.

The present invention relates to tack pulling machines and more particularly to tack tion.

pulling machines which are employed for removing lasting tacks or fasteners from a lasted shoe preparatory to the sewing opera- Certain features of the invention, however, are not limited to use in this particnlar class of machines but are also capable of use in machines for pulling insole tacks or fasteners which are embedded in the material, with their heads flush with the surface thereof.

The object of the present invention is to provide a tack pulling mechanism having a simple and compact arrangement of parts and which removes tacks of varying sizes with speed and certainty and without liability of resulting damage to the operating parts of the mechanism.

With this object in view, the various features of the invention comprise certain novel features of construction, combinations and arrangements of parts hereinafter described and claimed, the advantages of which will be apparent to those skilled in the art from the following description.

In the accompanying drawings illustrating the preferred form of the invention; Figure 1 is a side elevation of a tack pulling machine illustrating the several features of the invention in their preferred form; Fig. 2 is a detail showing a side elevation upon an enlarged scale of the movable tack pulling jaw and operating mechanism therefor; Fig. 3 is a plan view of the mechanism illustrated in Fig. 2; and Fig. 4 is a view, partially diagrammatic, illustrating the relation between the path of movement of the movable jaw and the face of the fixed jaw.

The tack pulling mechanism comprises essentially a movable tack pulling jaw which moves forward over the tack to be pulled and then describes a loop in order to engage the tack and pull the tack upon the back- The proper movenected to the arm intermediate its ends.

The jaw is rigidly supported upon the outer end of the arm and is provided with a tack engaging end directed toward the crank. In the preferred form of the invention a cooperating stationary jaw is provided and the tack pulling jaw is caused to move in an orbital path above the face of the stationary jaw. The tack pulling movement takes place in a linear direction substantially parallel to the face of the stationary jaw and normal to the plane of the sole so that there is no tendency to displace the shoe during the removal of the tacks.

In the illustrated embodiment of the invention, the machine is supported upon a suitable base 1 in the upper portion of which is supported a main driving shaft 3 journaled in bearings 4 and 5 formed upon the machine frame. Apulle y 6 is keyed to the main shaft 3 and serves to actuate the tack pulling mechanism, as will be hereinafter described.

The movable tack pulling jaw 8 is connected to the outer end of a supporting arm 9 through a head 10 by means of which both a horizontal and a vertical adjustment of the jaw relatively to the supporting arm may be obtained. The jaw has provision for a lateral or horizontal adjustment in the head by a suitable bolt and slot connection 11, and the head has provision for a vertical adjustment relatively to the arm by a suitable bolt and slot connection 12. A reciprocatory movement is imparted to the arm 9 by a crank 13, and this movement is modified by a supporting link 14 which is pivot-ally connected to the arm at 15 and is journaled at its opposite end upon avstud shaft 16. The crank shaft 17 has a pulley 18 secured to one end thereof and is actuated from the drive pulley G'by a suitable belt 19 which is guided in its course by an idler pul ley 20. The tack pulling mechanism as a whole is supported upon a bracket 21 which is detachably fastened to th base in any suitable manner and which is provided with arms 22 and 23 projecting therefrom and forming bearings for the stud shaft 16 and crank sha t 17 respectively. With this 0011- struction, the moving parts of the tack pulling mechanism may be removed in their entirety when desired.

A stationary jaw, indicated at 24, is fastened to the tack receiving throat immediately beneath the movable jaw andforms a-thrust plate, against which the tack is pressed by the movable jaw. The jaw 24: is formed from a spring plate 25 which is conveniently fastened to the under side of the throat by bolts 26. The bottom of the tack receiving throat or passageway 27 is removement of the tack and insures that the tack will be ejected from between the jaws and fiy into the throat properly. The front portion of the plate 25 projects laterally to one side, forming an L-shaped member, and the front edge of this member forms a continuous unbroken surface, along which the tacks are guided into engagement with the movable jaw.

From an inspection of Fig. 4, it will be noted that the movable jaw has a tack pulling movement in a linear direction substantially parallel with the face of the fixed jaw in order to pull the tack, and that slightly beyond the termination of the face the path dips in order to positively eject the tack into the receiving throat. The movable jaw then describes a loop and returns to its initial tack engaging position.

During its tack pulling movement, the speed of the movable jaw is nearly equal to the circumferential speed of the outer end of the crank, the supporting arm during this portion of the movement being reciprocated substantially parallel to the'face of the fixed jaw by the operating crank. Upon the re turn movement of the jaw, however, and just prior to the engagement of the tack, the supporting arm is oscillated about its pivotal connection 15 by the operating crank and inasmuch as the pivotal point is located approximately two thirds of the distance from the crank to the outer end of the 'arm, the rapidity of movement of the outer end of the arm will be approximatelyone half that of the inner end. It will thus be seen that during the movement of the jaw into a tack engaging position, it is moving at substan tially its slowest or retarded rate of speed and that after the tack has been grasped and during the pulling movement, the movable mode of operation will be apparent, and especially'so when it is considered that-in previous constructions of this type which are actuated by a single crank, the exact opposite mode of operation takes place and the tack pulling jaw engages the tack when traveling at a high rate of speed and pulls the tack at a slower rate of speed. i 4

The moving parts of the tack pulling mechanism are suitably inclosed by a curved guard 28 which is fastened tothe bracket 21 by bolts 29. A second guard 30 is fastened to the bracket by bolts 31 and serves to inclose the drive pulleys and crank shaft A downhold 32 is secured to the guard 28 so as to be capable of a vertical adjustment and the adjacent edges of the jaw and downhold form a throat, the edges of which engage the lasting tacks when the shoe is presented to the machine and'guide the tacks into a position to be engaged by the tack pullingjaw. While it is preferred to employ 'the specific construction and arrangement of parts shown and described, it will be understood that this construction and arrangement is not essential except so far as specified in'the claims and may be changed or modified without departing from the broaderfeatures of the invention.

It is also to be understood that except as specified in the claims, the invention is not limited to the employment of the tack pulling jaw in combination with a cooperating jaw, nor is it limited to the employment of the jaw for removing side tacks, but contemi plates the use of the jaw if so desired for the removal of insole tacks or fastenings which are embedded in the material with their heads flush with the surface thereof. H

' What is claimed is j 1. A tack pulling machine having, in combination, a jaw supporting arm, a crank directly connected to oneend of the arm,

an oscillatory supportinglink pivotally con-j nected to the arm intermediate its ends, a tack pulling jaw rigidly connected to the free end of the arm and having its tack en gaging end directed toward the crank, and means for rotating the'cra'nk in a direction to cause the jaw to move forwardjover the tack and pull the tack during its backward stroke, substantially as described. j

2. A tack pulling machine having, in combination, a jaw supporting arm, a crank directly connected to one end of the arm, an oscillatory supporting link pivotally. connected to the arm int-ermc'diateits ends, a,

tack pulling jaw rigidly connected to the free end of the arm and having its tack err- I gaging end directed toward the crank, a 00-" operating stationary jaw provided with a work engaging face extending substantially parallel to the direction of the tack pulling movement, and means for rotating the crank in a direction to cause the jaw to move for- Ward over a tack and pull the tack on its backward stroke, substantially as described.

3.. A tack pulling machine having, in combination, a tack pulling jaw arranged to move forward over a tack and pull a tack on its backward stroke and actuating mechanism for imparting the proper movement to the jaw comprising a crank, a supporting arm directly connected thereto at one end and having the jaw rigidly connected to its, opposite free end and an oscillatory supporting. link pivotally connected to the arm intermediate its ends, the actuating mechanism being constructed and arranged to imparta retarded tack engaging movementand an accelerated tack pulling movement to the jaw, substantially as described.

4. A tack pulling machine having, in combination, a tack pulling jaw arranged to move forward over a tack and pull a tack on its backward stroke, a stationary jaw provide'd with a work engaging face extending substantially parallel to the direction of the tack pulling movement, and actuating meclr anism for imparting the proper movement to the jaw comprising a crank, a supporting arm directly connected thereto at one end and having the jaw rigidly connected to its opposite free end, and an oscillatory supporting link pivotally connected to the arm intermediate its ends, the actuating mechanism being constructed and arranged to 1111- part a retarded tack engaging movement and an accelerated tack pulling movementto the jaw, substantially as described.

I FRED L. MAoKENZIE. Witnesses:

CHESTER E. Rooms, LAURA M. Goonnmen. 

